package main

import (
	"fmt"
	"math"
)

func main() {
	fmt.Println(hypot(3, 4))
	fmt.Println(sub(3, 4))
	fmt.Println(first(3, 2))
	fmt.Println(zero(3, 2))
}

func hypot(x, y float64) float64 {
	return math.Sqrt(x*x + y*y)
}

func sub(x, y int) (z int) { z = x - y; return }

func first(x int, _ int) int { return x }

func zero(int, int) int { return 0 }
